Metal stair.



G. W. BROOKS.

METAL STAIR.

APPLICATION FILED Aue.17. 1914.

Patented Apr. 13, 1915.

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G. w. BROOKS.

METAL sum.

Patented Apr. 13, 1915.

2 SHEETSSHEET 2.

APPLICATION FILED AUGJF, 1914.

GEORGE WQZBBOOKS, OF TOPEKA, KANSAS,

METAL STAIR.

Specification of Letters Patent.

Patented Apr. 13, 1915.

Application filed August 17, 1914. Serial No. 857,196. i

To all whom it may concern Be it known that I, GEORGE W. BROOKS, a citizen of the United States, residing at Topeka, in the county of Shawnee and State of Kansas, have invented certain new and useful Im rovements in Metal Stairs, Of which the ollowing is a specification.

This invention relates to certain new and useful improvements in metal stairs and it has for its objects among others to provide an improved stair riser and tread, as well as a self-contained lock which serves to connect the riser and tread, the same being retained in place by the filling of whatever nature it may be. g

It has for a further object to provide the lower end of the riser with an outward curve whereby the upper face of the tread surface, be it concrete or whatever substance may be employed, constitutes a substantial tangent for the upper face of said curve, thereby avoiding sharp angles at such point.

It has for a further object to provide an economical tread and a face riser of a formed piece of metal making a finish to the front of a solid concrete stair tread.

As is well-known in common practlce solid concrete stairs as now constructed are subject to considerable damage as thenosings often get broken and besides requirlng the most careful construction, the finished appearance looks anything but neat.

By my construction the finish is uniform, always pleasing and the steel facing protects the whole face of the riser, leaving the tread to be built up solid with concrete, if desired. Suitable reinforcements may be employed when desired.

The generic idea is capable of embodiment in a variety of forms.

Other objects and advantages of the in vention will hereinafter appear and the novel features thereof will be particularly pointed out in the appended claims,

The invention in its preferred forms is clearly illustrated in the accompanying drawings, which, with the numerals of reference marked thereon, form a. part of this specification, and in which-- Figure 1 is a vertical section through a Portion of t o adjoining reads, with -P0r= tionsbroken away, Fig.2 is a similar view showing a slightly modified form. Fig. 3 is a like view showing ancther mode of; em

bodiment of the invention. Fig. 4 is a like View showrng still another form. Fig. 5 shows n similar vertical section still another form of embodiment of the invention.

Fig. 6 shows a similar view of still another form. F 1g. 7 shows a similar view of still another form. Fig. 8 is a perspective view still retains the full strength and, in fact,

the strength is quite materially increased by the vertical flanges 5 of these grooves, as will be apparent. The formation of these grooves also lessens the amount of filling material necessarily employed for filling the treads or platforms. This tread is shown as provided at the front end with a horizontal flange 6 and at the rear end with an upwardly and forwardly inclined flange 7 which serve, in connection with the oppositely and downwardly inclined flange 8 of the riser 9, to form a locking joint and reinforcement on the front of the riser. This riser, which is formed of a single piece of suitable material, such as steel, serves to make a finish to the front of the stair tread, especially when solid concrete material is employed, The lower end of the riser adj acent its flange 8 is curved outwardly, as seen in the different views, so as to avoid a sharp angle at its junction with the filling, the up- I per face of the latter constituting a tangent from the upper face ofsaid curve. This riser has near its upper end the horizontal flange 10 upon which rests the front flange 6 of the tread, and from said horizontal flange rises the vertical flange 11 against which the forward end of the flange 6 abuts,

the riser terminating at its upper end in the curved nosing 12.

13 is a filling which may be of any suitable material, either concrete, petro-pulp or any other preferred composition filling the depressions in the tread and its upper surface flush with the top face of the nosing.

Suitable reinforcing members, as 14, may be employed, as seen in Fig. 1, although this is not deemed necessary.

The overlap ing upwardly and downwardly inclined flanges 7 and 8 may be further secured by means of a bolt 15 should occasion require, but this may be omitted and these members which form a self-contained lock for connecting the riser and tread may be held in place solely by the composition employed, as is shown in Figs. 4 and 5 soon to be described.

The construction shown in Fig. 2 is practically the same as that shown in Fig. 1 and above described except that the supporting angle 16 in Fig. 1 is reversed, as at 17 in said Fig. 2.

Fi 3 shows a construction similar to that of Figs. 1 and 2 in all details except that the grooves 2, 3 and 4 are filled with wooden strips 18, 19 and 20 upon which is placed a filling or tread proper 21 of cork, linoleum or other suitable material which may be screwed down to the wood fillers, as indicated at 22. This forms an ideal way of holding down the cork or linoleum carpet on the stairway or platform.

In Fig. 4 I have shown a construction embodying the same structural features as hereinbefore described except that the depth of the tread is lessened'and the grooves are dispensed with. This form of tread is made ,for a cement or concrete filling 23 which, as hereinbefore stated, serves to hold in place the self-contained lock formed by the flange members 7 and 8.

In Fig. 5 I have shown another form designed for supporting a cork carpet or linoleum 24 which serves to hold in place the flange members 7 and 8, as shown. In this form the depending pocket illustrated in the prior forms is dispensed with and the forward end of the tread is supported upon a channel iron 25, the lower flange 26 of which rests upon the horizontal flange 10 of the riser to which it may be bolted, if desired, as by a bolt 27. The tread rests upon the upper flange 28 of its angle member. In this form the nosing 12 of the riser is shown as terminating slightlyin practice say an eighth of an inchbelow the top of the linoleum or cork 24, leaving the linoleum projecting above the steel nosing. The riser serves to firmly hold and protect the edge of the linoleum and also prevents the feet from slipping by coming in contact with the steel, thus making an easy and safe tread for stairs.

In Fig. 6 I have shown a tread and riser designed for a concrete or cement filling 29. In this form the salient features of the other forms are retained and the overlapped locking flanges 7 and 8 may or may not be secured by a bolt 30. The concrete or cement filling 29, however, usually is sufiicient to retain these parts in place. In this form the depending pocket at the front end of the tread is dispensed with and the forward end of the tread rests upon the flange G of the riser and to which it may be bolted, as by a bolt 31.

Fig. 7 shows a steel riser or face bracket 32 with the nosing 33, the horizontal flange 34 and the downwardly and rearwardly projecting flange 35 adapted to be embedded in the solid concrete tread 36. During the construction of the stair, this is held in place by the usual wood forms and by metallic anchors 37, any desired number being employed according to the size of the stair. These anchors may be bolted to the horizontal flange 38 of the riser by a bolt 39 or the like. These anchors are securely held in place after the concrete is poured into the tread forms and serve not only as anchors but as reinforcements. They may be provided with projections 40 which may assume any desired shape, that shown in Figs. 7 and 8 having been found to be very effective for this purpose. It has been found that this provides a very eflicient means for finishing solid concrete stairs. The concrete is held within the concavity of the nosing and this, in connection with the anchors, serves to firmly hold the riser in place.

Modifications in details may be resorted to without departing from the spirit of the invention or sacrificing any of its advantages.

It is deemed important that the overlapping flanges 7 and 8 be inclined from a perm0 pendicular and extend throughout the entire width of the riser and tread whereby, while affording slight resiliency, they provide a dovetail or undercut portion against which the filling is engaged and the natural 105 tendency is to press said filling toward the front of the tread and avoid any possibility of its displacement.

What is claimed as new is 1. A metallic riser having a nosing at its no upper end and an inwardly and downwardly inclined flange at its lower end, and a separately formed tread having at its rear end an upwardly and forwardly inclined flange overlapping the flange of the riser, said riser 115 having adjacent its nosing a horizontal flange to support the forward end of the tread, said riser being outwardly curved adjacent its inclined flange whereby said curve constitutes a tangent to the upper 12o face of the filling employed.

2. A metallic riser having a nosingat its upper end and an inwardly and downwardly inclined flange at its lower end, and a separately formed tread having at its rear end 125 1 an upwardly and forwardly inclined flange overlapping the flange of the riser, said riser having adjacent its nosing a horizontal flange to support the forward end of the tread, said riser being outwardly curved adiee j acent its inclined flange whereby said curve constitutes a tangent to the upper face of the filling employed, said tread having transverse alternating grooves for the reception of blocks.

3. A metallic riser having a nosing at its upper end and an inwardly and downwardly inclined flange at its lower end, and a separately formed tread having at its rear end an upwardly and forwardly inclined flange overlapping the flange of the riser, said riser having adjacent its nosing a horizontal flange to support the forward end of the tread, said rlser being outwardly curved adjacent its inclined flange .Whereby said curve constitutes a tangent to the upper face of the filling employedfsaid tread having transverse alternating grooves for the reception of blocks, and wooden fillers in said grooves to receive securing means for a covering.

GEORGE W. BROOKS. -Witnesses:

J. R. Moonn, G. L. BYBEE. 

